Table 1.

Scale quantifying the spectrum of the antibiotic treatment

Step	Treatment
1	Non-antipseudomonal penicillins (amoxicillin-clavulanate)
	Second generation or third generation non-antipseudomonal cephalosporins (cefuroxime, ceftriaxone)
	Trimethoprim/sulfamethoxazole
2	Antipseudomonal penicillins (piperacillin-tazobactam)
	Third generation antipseudomonal cephalosporins (ceftazidime)
3	Fluoroquinolones (ciprofloxacin, levofloxacin, moxifloxacin)
4	Antipseudomonal carbapenems (meropenem)
5	Combination therapy of two or more antibiotic agents